comparison lib/ur/listPair.ur @ 1421:3dab4696d116

Subqueries may always return NULL
author Adam Chlipala <adam@chlipala.net>
date Thu, 03 Feb 2011 21:04:12 -0500
parents 1c2f335297b7
children 5c30eea7aa78
comparison
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1420:146b69c53304 1421:3dab4696d116